Name: Your Name (What ever you want)
Email: Your username
Password: Your web.de account password
Description:
Click Next Button
Hostname: imap.web.de
Username: Your username
Password: Your web.de account password
Hostname: smtp.web.de
Username: Your username
Password: Your web.de account password
Click Save Button
Use SSL: Yes
Authentication: Password
Server Port: 993
Use SSL: Yes
Authentication: Password
Server Port: 587
You can login web.de and Signup for web.de new account on your iPhone from here.